Why does God command his already perfectly loyal Angels to worship the second person of the Godhead (Hebrews 1:6)?

**Hebrews 1:6** (NIV) says: > when God brings his firstborn into the world, he says, “Let all God’s angels worship him.” My question is for Trinitarians, Modalists and Binitarians: ***Why was it necessary for God to give the command to his already perfectly loyal Angels to worship the second person or mode of the Godhead, whom** (one would assume) **they already always included in their worship?*** Quotes from Creeds or scholars of the different views, making sense out of this, are welcome.